<?php
// +----------------------------------------------------------------------
// | TOPThink [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2010 http://topthink.com All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: 麦当苗儿 <zuojiazi@vip.qq.com> <http://www.zjzit.cn>
// +----------------------------------------------------------------------
// | ImageImagick.class.php 2013-03-06
// +----------------------------------------------------------------------
namespace CLib\Image;

c_lib()->load('image');

use CLib\Image;
use CLib\ImageInterface;

class Imagick implements ImageInterface{
	/**
	 * 图像资源对象
	 * @var \Imagick
	 */
	private $img;

	/**
	 * 图像信息，包括width,height,type,mime,size
	 * @var array
	 */
	private $info;

	/**
	 * 构造方法，可用于打开一张图像
	 * @param string $imgname 图像路径
	 */
	public function __construct($imgname = NULL){
		$imgname && $this->open($imgname);
	}

	/**
	 * 打开一张图像
	 * @param  string $imgname 图像路径
	 * @throws \Exception
	 */
	public function open($imgname){
		//检测图像文件
		if(!is_file($imgname)){
			throw new \Exception(_('The image file does not exist'));
		}

		//销毁已存在的图像
		empty($this->img) || $this->img->destroy();

		//载入图像
		$this->img = new \Imagick(realpath($imgname));

		//设置图像信息
		$this->info = array(
			'width' => $this->img->getImageWidth(),
			'height' => $this->img->getImageHeight(),
			'type' => strtolower($this->img->getImageFormat()),
			'mime' => $this->img->getImageMimeType(),
		);
	}

	/**
	 * 保存图像
	 * @param  string  $imgname   图像保存名称
	 * @param  string  $type      图像类型
	 * @param  boolean $interlace 是否对JPEG类型图像设置隔行扫描
	 * @throws \Exception
	 */
	public function save($imgname, $type = NULL, $interlace = true){
		if(empty($this->img)){
			throw new \Exception(_('No image resources can be saved'));
		}

		//设置图片类型
		if(is_null($type)){
			$type = $this->info['type'];
		} else{
			$type = strtolower($type);
			$this->img->setImageFormat($type);
		}

		//JPEG图像设置隔行扫描
		if('jpeg' == $type || 'jpg' == $type){
			$this->img->setImageInterlaceScheme(1);
		}

		//去除图像配置信息
		$this->img->stripImage();

		//保存图像
		$imgname = realpath(dirname($imgname)) . '/' . basename($imgname); //强制绝对路径
		if('gif' == $type){
			$this->img->writeImages($imgname, true);
		} else{
			$this->img->writeImage($imgname);
		}
	}

	/**
	 * 返回图像宽度
	 * @return integer 图像宽度
	 * @throws \Exception
	 */
	public function width(){
		if(empty($this->img)){
			throw new \Exception(_('Not specified image resource'));
		}
		return $this->info['width'];
	}

	/**
	 * 返回图像高度
	 * @return integer 图像高度
	 * @throws \Exception
	 */
	public function height(){
		if(empty($this->img)){
			throw new \Exception(_('Not specified image resource'));
		}
		return $this->info['height'];
	}

	/**
	 * 返回图像类型
	 * @return string 图像类型
	 * @throws \Exception
	 */
	public function type(){
		if(empty($this->img)){
			throw new \Exception(_('Not specified image resource'));
		}
		return $this->info['type'];
	}

	/**
	 * 返回图像MIME类型
	 * @return string 图像MIME类型
	 * @throws \Exception
	 */
	public function mime(){
		if(empty($this->img)){
			throw new \Exception(_('Not specified image resource'));
		}
		return $this->info['mime'];
	}

	/**
	 * 返回图像尺寸数组 0 - 图像宽度，1 - 图像高度
	 * @return array 图像尺寸
	 * @throws \Exception
	 */
	public function size(){
		if(empty($this->img)){
			throw new \Exception(_('Not specified image resource'));
		}
		return array(
			$this->info['width'],
			$this->info['height']
		);
	}

	/**
	 * 裁剪图像
	 * @param  integer $w      裁剪区域宽度
	 * @param  integer $h      裁剪区域高度
	 * @param  integer $x      裁剪区域x坐标
	 * @param  integer $y      裁剪区域y坐标
	 * @param  integer $width  图像保存宽度
	 * @param  integer $height 图像保存高度
	 * @throws \Exception
	 */
	public function crop($w, $h, $x = 0, $y = 0, $width = NULL, $height = NULL){
		if(empty($this->img)){
			throw new \Exception(_('No image can be cropped resources'));
		}

		//设置保存尺寸
		empty($width) && $width = $w;
		empty($height) && $height = $h;

		//裁剪图片
		if('gif' == $this->info['type']){
			$img = $this->img->coalesceImages();
			$this->img->destroy(); //销毁原图

			//循环裁剪每一帧
			do{
				$this->_crop($w, $h, $x, $y, $width, $height, $img);
			} while($img->nextImage());

			//压缩图片
			$this->img = $img->deconstructImages();
			$img->destroy(); //销毁零时图片
		} else{
			$this->_crop($w, $h, $x, $y, $width, $height);
		}
	}

	/* 裁剪图片，内部调用 */
	private function _crop($w, $h, $x, $y, $width, $height, $img = NULL){
		is_null($img) && $img = $this->img;

		//裁剪
		$info = $this->info;
		if($x != 0 || $y != 0 || $w != $info['width'] || $h != $info['height']){
			$img->cropImage($w, $h, $x, $y);
			$img->setImagePage($w, $h, 0, 0); //调整画布和图片一致
		}

		//调整大小
		if($w != $width || $h != $height){
			$img->sampleImage($width, $height);
		}

		//设置缓存尺寸
		$this->info['width'] = $w;
		$this->info['height'] = $h;
	}

	/**
	 * 生成缩略图
	 * @param  integer $width  缩略图最大宽度
	 * @param  integer $height 缩略图最大高度
	 * @param  integer $type   缩略图裁剪类型
	 * @throws \Exception
	 */
	public function thumb($width, $height, $type = Image::IMAGE_THUMB_SCALE){
		if(empty($this->img)){
			throw new \Exception(_('No image can be abbreviated Resources'));
		}

		//原图宽度和高度
		$w = $this->info['width'];
		$h = $this->info['height'];

		/* 计算缩略图生成的必要参数 */
		switch($type){
			/* 等比例缩放 */
			case Image::IMAGE_THUMB_SCALE:
				//原图尺寸小于缩略图尺寸则不进行缩略
				if($w < $width && $h < $height){
					return;
				}

				//计算缩放比例
				$scale = min($width / $w, $height / $h);

				//设置缩略图的坐标及宽度和高度
				$x = $y = 0;
				$width = $w * $scale;
				$height = $h * $scale;
				break;

			/* 居中裁剪 */
			case Image::IMAGE_THUMB_CENTER:
				//计算缩放比例
				$scale = max($width / $w, $height / $h);

				//设置缩略图的坐标及宽度和高度
				$w = $width / $scale;
				$h = $height / $scale;
				$x = ($this->info['width'] - $w) / 2;
				$y = ($this->info['height'] - $h) / 2;
				break;

			/* 左上角裁剪 */
			case Image::IMAGE_THUMB_NORTHWEST:
				//计算缩放比例
				$scale = max($width / $w, $height / $h);

				//设置缩略图的坐标及宽度和高度
				$x = $y = 0;
				$w = $width / $scale;
				$h = $height / $scale;
				break;

			/* 右下角裁剪 */
			case Image::IMAGE_THUMB_SOUTHEAST:
				//计算缩放比例
				$scale = max($width / $w, $height / $h);

				//设置缩略图的坐标及宽度和高度
				$w = $width / $scale;
				$h = $height / $scale;
				$x = $this->info['width'] - $w;
				$y = $this->info['height'] - $h;
				break;

			/* 填充 */
			case Image::IMAGE_THUMB_FILLED:
				//计算缩放比例
				if($w < $width && $h < $height){
					$scale = 1;
				} else{
					$scale = min($width / $w, $height / $h);
				}

				//设置缩略图的坐标及宽度和高度
				$neww = $w * $scale;
				$newh = $h * $scale;
				$posx = ($width - $w * $scale) / 2;
				$posy = ($height - $h * $scale) / 2;

				//创建一张新图像
				$newimg = new \Imagick();
				$newimg->newImage($width, $height, 'white', $this->info['type']);


				if('gif' == $this->info['type']){
					$imgs = $this->img->coalesceImages();
					$img = new \Imagick();
					$this->img->destroy(); //销毁原图

					//循环填充每一帧
					do{
						//填充图像
						$image = $this->_fill($newimg, $posx, $posy, $neww, $newh, $imgs);

						$img->addImage($image);
						$img->setImageDelay($imgs->getImageDelay());
						$img->setImagePage($width, $height, 0, 0);

						$image->destroy(); //销毁零时图片

					} while($imgs->nextImage());

					//压缩图片
					$this->img->destroy();
					$this->img = $img->deconstructImages();
					$imgs->destroy(); //销毁零时图片
					$img->destroy(); //销毁零时图片

				} else{
					//填充图像
					$img = $this->_fill($newimg, $posx, $posy, $neww, $newh);
					//销毁原图
					$this->img->destroy();
					$this->img = $img;
				}

				//设置新图像属性
				$this->info['width'] = $width;
				$this->info['height'] = $height;
				return;

			/* 固定 */
			case Image::IMAGE_THUMB_FIXED:
				$x = $y = 0;
				break;

			default:
				throw new \Exception(_('Does not support the type of crop thumbnails'));
		}

		/* 裁剪图像 */
		$this->crop($w, $h, $x, $y, $width, $height);
	}

	/**
	 * 填充指定图像，内部使用
	 * @param \Imagick $newimg
	 * @param          $posx
	 * @param          $posy
	 * @param          $neww
	 * @param          $newh
	 * @param null     $img
	 * @return mixed
	 */
	private function _fill($newimg, $posx, $posy, $neww, $newh, $img = NULL){
		is_null($img) && $img = $this->img;

		/* 将指定图片绘入空白图片 */
		$draw = new \ImagickDraw();
		$draw->composite($img->getImageCompose(), $posx, $posy, $neww, $newh, $img);
		/**
		 * @var \Imagick $image
		 */
		$image = $newimg->clone();
		$image->drawImage($draw);
		$draw->destroy();

		return $image;
	}

	/**
	 * 添加水印
	 * @param  string  $source 水印图片路径
	 * @param  integer $locate 水印位置
	 * @param  integer $alpha  水印透明度
	 * @throws \Exception
	 */
	public function water($source, $locate = Image::IMAGE_WATER_SOUTHEAST, $alpha = 80){
		//资源检测
		if(empty($this->img)){
			throw new \Exception(_('No watermark can be added to image resources'));
		}
		if(!is_file($source)){
			throw new \Exception(_('Watermark image absence'));
		}

		//创建水印图像资源
		$water = new \Imagick(realpath($source));
		$info = array(
			$water->getImageWidth(),
			$water->getImageHeight()
		);

		/* 设定水印位置 */
		switch($locate){
			/* 右下角水印 */
			case Image::IMAGE_WATER_SOUTHEAST:
				$x = $this->info['width'] - $info[0];
				$y = $this->info['height'] - $info[1];
				break;

			/* 左下角水印 */
			case Image::IMAGE_WATER_SOUTHWEST:
				$x = 0;
				$y = $this->info['height'] - $info[1];
				break;

			/* 左上角水印 */
			case Image::IMAGE_WATER_NORTHWEST:
				$x = $y = 0;
				break;

			/* 右上角水印 */
			case Image::IMAGE_WATER_NORTHEAST:
				$x = $this->info['width'] - $info[0];
				$y = 0;
				break;

			/* 居中水印 */
			case Image::IMAGE_WATER_CENTER:
				$x = ($this->info['width'] - $info[0]) / 2;
				$y = ($this->info['height'] - $info[1]) / 2;
				break;

			/* 下居中水印 */
			case Image::IMAGE_WATER_SOUTH:
				$x = ($this->info['width'] - $info[0]) / 2;
				$y = $this->info['height'] - $info[1];
				break;

			/* 右居中水印 */
			case Image::IMAGE_WATER_EAST:
				$x = $this->info['width'] - $info[0];
				$y = ($this->info['height'] - $info[1]) / 2;
				break;

			/* 上居中水印 */
			case Image::IMAGE_WATER_NORTH:
				$x = ($this->info['width'] - $info[0]) / 2;
				$y = 0;
				break;

			/* 左居中水印 */
			case Image::IMAGE_WATER_WEST:
				$x = 0;
				$y = ($this->info['height'] - $info[1]) / 2;
				break;

			default:
				/* 自定义水印坐标 */
				if(is_array($locate)){
					list($x, $y) = $locate;
				} else{
					throw new \Exception(_('Does not support the type of watermark location'));
				}
		}

		//创建绘图资源
		$draw = new \ImagickDraw();
		$draw->composite($water->getImageCompose(), $x, $y, $info[0], $info[1], $water);

		if('gif' == $this->info['type']){
			$img = $this->img->coalesceImages();
			$this->img->destroy(); //销毁原图

			do{
				//添加水印
				$img->drawImage($draw);
			} while($img->nextImage());

			//压缩图片
			$this->img = $img->deconstructImages();
			$img->destroy(); //销毁零时图片

		} else{
			//添加水印
			$this->img->drawImage($draw);
		}

		//销毁水印资源
		$draw->destroy();
		$water->destroy();
	}

	/**
	 * 图像添加文字
	 * @param  string  $text   添加的文字
	 * @param  string  $font   字体路径
	 * @param  integer $size   字号
	 * @param  string  $color  文字颜色
	 * @param  integer $locate 文字写入位置
	 * @param  integer $offset 文字相对当前位置的偏移量
	 * @param  integer $angle  文字倾斜角度
	 * @throws \Exception
	 */
	public function text($text, $font, $size, $color = '#00000000', $locate = Image::IMAGE_WATER_SOUTHEAST, $offset = 0, $angle = 0){
		//资源检测
		if(empty($this->img)){
			throw new \Exception(_('No image can be written to a text resources'));
		}
		if(!is_file($font)){
			throw new \Exception(_("Font file does not exist:").$font);
		}

		//获取颜色和透明度
		if(is_array($color)){
			$color = array_map('dechex', $color);
			foreach($color as &$value){
				$value = str_pad($value, 2, '0', STR_PAD_LEFT);
			}
			$color = '#' . implode('', $color);
		} elseif(!is_string($color) || 0 !== strpos($color, '#')){
			throw new \Exception(_('Wrong color values'));
		}
		$col = substr($color, 0, 7);
		$alp = strlen($color) == 9 ? substr($color, -2) : 0;


		//获取文字信息
		$draw = new \ImagickDraw();
		$draw->setFont(realpath($font));
		$draw->setFontSize($size);
		$draw->setFillColor($col);
		$draw->setFillAlpha(1 - hexdec($alp) / 127);
		$draw->setTextAntialias(true);
		$draw->setStrokeAntialias(true);

		$metrics = $this->img->queryFontMetrics($draw, $text);

		/* 计算文字初始坐标和尺寸 */
		$x = 0;
		$y = $metrics['ascender'];
		$w = $metrics['textWidth'];
		$h = $metrics['textHeight'];

		/* 设定文字位置 */
		switch($locate){
			/* 右下角文字 */
			case Image::IMAGE_WATER_SOUTHEAST:
				$x += $this->info['width'] - $w;
				$y += $this->info['height'] - $h;
				break;

			/* 左下角文字 */
			case Image::IMAGE_WATER_SOUTHWEST:
				$y += $this->info['height'] - $h;
				break;

			/* 左上角文字 */
			case Image::IMAGE_WATER_NORTHWEST:
				// 起始坐标即为左上角坐标，无需调整
				break;

			/* 右上角文字 */
			case Image::IMAGE_WATER_NORTHEAST:
				$x += $this->info['width'] - $w;
				break;

			/* 居中文字 */
			case Image::IMAGE_WATER_CENTER:
				$x += ($this->info['width'] - $w) / 2;
				$y += ($this->info['height'] - $h) / 2;
				break;

			/* 下居中文字 */
			case Image::IMAGE_WATER_SOUTH:
				$x += ($this->info['width'] - $w) / 2;
				$y += $this->info['height'] - $h;
				break;

			/* 右居中文字 */
			case Image::IMAGE_WATER_EAST:
				$x += $this->info['width'] - $w;
				$y += ($this->info['height'] - $h) / 2;
				break;

			/* 上居中文字 */
			case Image::IMAGE_WATER_NORTH:
				$x += ($this->info['width'] - $w) / 2;
				break;

			/* 左居中文字 */
			case Image::IMAGE_WATER_WEST:
				$y += ($this->info['height'] - $h) / 2;
				break;

			default:
				/* 自定义文字坐标 */
				if(is_array($locate)){
					list($posx, $posy) = $locate;
					$x += $posx;
					$y += $posy;
				} else{
					throw new \Exception(_('Position of the character type is not supported'));
				}
		}

		/* 设置偏移量 */
		if(is_array($offset)){
			$offset = array_map('intval', $offset);
			list($ox, $oy) = $offset;
		} else{
			$offset = intval($offset);
			$ox = $oy = $offset;
		}

		/* 写入文字 */
		if('gif' == $this->info['type']){
			$img = $this->img->coalesceImages();
			$this->img->destroy(); //销毁原图
			do{
				$img->annotateImage($draw, $x + $ox, $y + $oy, $angle, $text);
			} while($img->nextImage());

			//压缩图片
			$this->img = $img->deconstructImages();
			$img->destroy(); //销毁零时图片

		} else{
			$this->img->annotateImage($draw, $x + $ox, $y + $oy, $angle, $text);
		}
		$draw->destroy();
	}

	/**
	 * 析构方法，用于销毁图像资源
	 */
	public function __destruct(){
		empty($this->img) || $this->img->destroy();
	}
}